Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 604
iving telephones, usually of the Bell form. The primary current passes through the springs, D E,and the primary wire of the induction coil. The vibrations TELEPHONE, MICROPHONE, ELECTRICAL MAGIC. 581 of the diaphragm vary the contact between the platinumbutton and the carbon, and produce a… … ii |i|r The Bhikc Telephonic Transmitter. t(j work this transmitter. It will be noticed that whilethe spring, D, is in contact with the diaphragm, the latteris insulated from everything else by the rubber bindingand the rubber tip of the spring. The box hinges are provided with springs soldered…
Physics · Lantern projection · Electric apparatus and appliances
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